fonts.cc File Reference

#include <memory>
#include "flutter/skwasm/export.h"
#include "flutter/skwasm/live_objects.h"
#include "flutter/skwasm/wrappers.h"
#include "third_party/skia/include/core/SkFontMgr.h"
#include "third_party/skia/include/ports/SkFontMgr_empty.h"
#include "third_party/skia/modules/skparagraph/include/FontCollection.h"
#include "third_party/skia/modules/skparagraph/include/TypefaceFontProvider.h"

Go to the source code of this file.

Functions
SKWASM_EXPORT Skwasm::FlutterFontCollection *	fontCollection_create ()
SKWASM_EXPORT void	fontCollection_dispose (Skwasm::FlutterFontCollection *collection)
static sk_sp< SkFontMgr >	default_fontmgr ()
SKWASM_EXPORT SkTypeface *	typeface_create (SkData *font_data)
SKWASM_EXPORT void	typeface_dispose (SkTypeface *typeface)
SKWASM_EXPORT int	typefaces_filterCoveredCodePoints (SkTypeface **typefaces, int typeface_count, SkUnichar *code_points, int code_point_count)
SKWASM_EXPORT void	fontCollection_registerTypeface (Skwasm::FlutterFontCollection *collection, SkTypeface *typeface, SkString *font_name)
SKWASM_EXPORT void	fontCollection_clearCaches (Skwasm::FlutterFontCollection *collection)

Function Documentation

default_fontmgr()

static sk_sp< SkFontMgr > default_fontmgr ( )

static

Definition at line 33 of file fonts.cc.

                                          {
  static sk_sp<SkFontMgr> mgr = SkFontMgr_New_Custom_Empty();
  return mgr;
}

Referenced by typeface_create().

fontCollection_clearCaches()

SKWASM_EXPORT void fontCollection_clearCaches

(

Skwasm::FlutterFontCollection *

collection

)

Definition at line 97 of file fonts.cc.

                                             {
  collection->collection->clearCaches();
}

References Skwasm::FlutterFontCollection::collection.

fontCollection_create()

SKWASM_EXPORT Skwasm::FlutterFontCollection * fontCollection_create

(

)

Definition at line 15 of file fonts.cc.

                                                                   {
  Skwasm::live_font_collection_count++;
  auto collection = sk_make_sp<skia::textlayout::FontCollection>();
  auto provider = sk_make_sp<skia::textlayout::TypefaceFontProvider>();
  collection->enableFontFallback();
  collection->setDefaultFontManager(provider, "Roboto");
  return new Skwasm::FlutterFontCollection{
      std::move(collection),
      std::move(provider),
  };
}

References Skwasm::live_font_collection_count.

fontCollection_dispose()

SKWASM_EXPORT void fontCollection_dispose

(

Skwasm::FlutterFontCollection *

collection

)

Definition at line 27 of file fonts.cc.

                                             {
  Skwasm::live_font_collection_count--;
  delete collection;
}

References Skwasm::live_font_collection_count.

fontCollection_registerTypeface()

SKWASM_EXPORT void fontCollection_registerTypeface	(	Skwasm::FlutterFontCollection *	collection,
		SkTypeface *	typeface,
		SkString *	font_name
	)

Definition at line 84 of file fonts.cc.

                         {
  if (font_name) {
    SkString alias = *font_name;
    collection->provider->registerTypeface(sk_ref_sp<SkTypeface>(typeface),
                                           alias);
  } else {
    collection->provider->registerTypeface(sk_ref_sp<SkTypeface>(typeface));
  }
}

References Skwasm::FlutterFontCollection::provider.

typeface_create()

SKWASM_EXPORT SkTypeface * typeface_create

(

SkData *

font_data

)

Definition at line 38 of file fonts.cc.

                                                             {
  Skwasm::live_typeface_count++;
  auto typeface = default_fontmgr()->makeFromData(sk_ref_sp<SkData>(font_data));
  return typeface.release();
}

References default_fontmgr(), and Skwasm::live_typeface_count.

typeface_dispose()

SKWASM_EXPORT void typeface_dispose

(

SkTypeface *

typeface

)

Definition at line 44 of file fonts.cc.

                                                          {
  Skwasm::live_typeface_count--;
  typeface->unref();
}

References Skwasm::live_typeface_count.

typefaces_filterCoveredCodePoints()

SKWASM_EXPORT int typefaces_filterCoveredCodePoints	(	SkTypeface **	typefaces,
		int	typeface_count,
		SkUnichar *	code_points,
		int	code_point_count
	)

Definition at line 52 of file fonts.cc.

                                                                          {
  std::unique_ptr<SkGlyphID[]> glyph_buffer =
      std::make_unique<SkGlyphID[]>(code_point_count);
  SkGlyphID* glyph_pointer = glyph_buffer.get();
  int remaining_code_point_count = code_point_count;
  for (int typeface_index = 0; typeface_index < typeface_count;
       typeface_index++) {
    typefaces[typeface_index]->unicharsToGlyphs(
        {code_points, remaining_code_point_count},
        {glyph_pointer, remaining_code_point_count});
    int output_index = 0;
    for (int input_index = 0; input_index < remaining_code_point_count;
         input_index++) {
      if (glyph_pointer[input_index] == 0) {
        if (output_index != input_index) {
          code_points[output_index] = code_points[input_index];
        }
        output_index++;
      }
    }
    if (output_index == 0) {
      return 0;
    } else {
      remaining_code_point_count = output_index;
    }
  }
  return remaining_code_point_count;
}